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Separation of p-Aminophenol From Raney Nickel Catalyst by Ceramic Membrane

JIN Shan

Abstract （479）

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Clarification of p-aminophenol feed containing Raney nickel catalyst by micro-filtration (MF) of ceramic membrane has been investigated. The experiments in the lab confirmed filtration the p-aminophenol feed by the ceramic membrane with pore size of 0.2 μm. The component of the cake and fouled membrane in pilot tests were analyzed and found that the pollutants were mainly Raney nickel catalyst. In the industrial application, an effective cleaning method to recover the membrane flux was suggested as follows: firstly washing with circulate solution of alcohol-water for 10 minutes; then rinsing the rig with 1vol% NaOH solution for 20 minutes; and 3% nitric acid solution for 60 minutes; finally industrial soft water for 60 minutes. The above cleaning operations were all performed at 100 ℃. The average permeate flux of a long running in the plant was 400 L/(m ²·h). The nickel content in the permeate liquid could not be determined by an atomic absorption spectrometry. So that in industrial conditions the Microfiltration of PAP suspension by a ceramic membrane is a reliable and efficient technology of the clarification.

2011, 31 (1): 21-24. DOI: 10.3696/j.issn.1672-6952.2011.01.006

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Analysis of Fouling Resistance of the Membrane and Cleaning Technique

JIN Wen-ying,ZHAO Yu，JIN Shan

Abstract （413）

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It was studied simulated acrylic fiber wastewater treatment used membrane bioreactor. In Lab research, the fouling mechanisms of the membrane in microfihration were studied. Every kind of resistances in the simulated acrylic fiber wastewater treatment was analyzed. The results show that the fouling is mainly from concentration polarization and cake layer under the conditions of the lower operating pressure. However, the fouling mainly from cake layer under the conditions of the higher operating pressure. The resistances from the block and itself is small, thus, they are the minor factors for the membrane fouling. The method of membrane cleaning were proposed, that is, membrane flux is up to better level after 1% H ₂O ₂ solution washing for 30 min or 0.1 mol/ L NaOH solution washing for 60 min.

2010, 30 (2): 4-7. DOI: 10.3696/j.issn.1672-6952.2010.02.002

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TG Analysis and Kinetics of Non-Woody Biomss  and Waste Plastic Co-Pyrolysis

ZHAO Yu， JIN Wen-ying， JIN Shan, LIU Chun-sheng

Abstract （379）

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hermal decomposition behaviours of no woody biomass (straw) and waste plastic (agricultural film) were investigated using TGA．The results showe that the biomass is decomposed at a wider temperature range than plastics, and the transfer efficiency of biomass is lowest because of the high content of ash and fixcarbon．It is exhibited significant synergistic effect created more the light component between biomass and plastic during co-pyrolysis. The kinetic analysis indicates that the pyrolytic processes can be described as first order reactions model, a quite good fitting of experimental data was obtained for all samples studied．The only plastic can be described as the one model, and the only biomass be described as the two consecutive models, than the biomass/plastic co-pyrolysis need be described as the four consecutive models. The activation energies were found to be in the rang of 64.6 ~ 306.6 kJ/mol, and the pre-exponential factors were 1.1×104～3.0×1022. 

2009, 29 (2): 15-18.

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Thermodynamic Study on the Solid-Liquid Equilibrium of p-Aminophenol

JIN Wen-ying， ZHAO Yu， JIN Shan

Abstract （450）

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The solubility of p-aminophenol in water, ethanol and the mixture of water and ethanol was determined respectively by the test apparatus established in the lab. The experimental water-solubility of p-aminophenol is in good consistency with the literature data, which confirms the reliability of the experimental apparatus and method. Using solubility model and S-H activity coefficient equation, the parameters lij of the solubility equation were obtained by correlating the solubility data. The thermodynamic model of the calculating solubility of p-aminophenol was obtained, which prove to be useful in predicting the solubility of p-aminophenol in the mixture solvent at higher temperature. The correlated solubility model and calculated results are consistent well with the experimental data.

2008, 28 (3): 19-22.

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Investigation of Backf lushing Used in Recovering Molecular Sieve Particles by Ceramic Microfiltrat ion Membrane

HUANG Yan -hua,GUO Wen -miao,JIN Shan

Abstract （343）

PDF （214KB）（330）

When the ceramic membrane is used to trea t micro -sized inorganic particle suspensions in the microfiltration process, the bigg est problem is that the membrane could be fouled easily .The technique of backflushing is a stable , valid and reusable method to control the membrane fouling in the microfiltration which is demonstrated by a lot of experiments.The investitation was made for the use of backflushing to control membrane fouling in recovering molecular sieve particles by ceramic microfiltration membrane .The influences of backflushing pressure, backflushing time , backflushing interval on the backflushing were studied .The most important factor affecting the recov erflux is backflushing pressure , backflushing time and backflushing interval have slight influence o n reco ver flux .Considering synthetically the influence of pressure proof , energy consume and investment of the equipments , the satisfied backflushing opera tio n parameters are determined:backflushingpressure is 0.4 MPa, backflushing time is 3 second.Based on engineering situation , the effective rate of permeate flux was taken as investigation object of the membrane system .The optimum backflushing interval is determined, which is 10 minutes , w hen the value of the rate of permea te flux arrives a t the maximum .

2005, 25 (1): 1-4.